s3: Attempt to fix a deadlock between smbd and ctdbd

s3: Attempt to fix a deadlock between smbd and ctdbd

In Samba we access the notify databases under the locking.tdb lock when closing a file. This leads to a deadlock with ctdb when doing a recovery.

This is a bad hack, and ctdb will need to get fixed for this. But for now, it
seems necessary.